strange behavior about response object in container

[Zhenxin wang]

Hi,

I am modifying the Tomcat 4.0.4 to make it a proxy cache server.

I am extending the container's (StandardHost) invoke(Request, Response) function  to 
be able to forward a request if there is no cache for it. I use the apache 
commons-httpclient to implement the forwarding semantics.
While I implement the transfering of data from httpclient method object to the 
Response object, I noticed some strange behavior regarding the Response object. 

What I did is first get a HttpServletResponse object reference from the Response 
object hresp, then I will call a loop of 
   resp.setHeader() , 
then I do
  OutputStream os = resp.getOutputStream();
  os.write(response_body_text_as_byte_array)

When the origin server is another Tomcat server, it does not work, however
if I comment out resp.setHeader(...), it is working (I mean the result shown in the 
browser)

I do the forwarding inside a servlet, even with rest.setHeader(...), it still works.

I wonder why is that? BTW, I am using IE 6 as browser.

I feel I should do the setting of headers, they may contain cookies and other info.

When I try against www.microsoft.com (url in the request), with header setting, it 
works, 
without header setting, it does not. Quite the opposite of Tomcat.

When I try against www.yahoo.com, i find the same behavior as Tomcat.

I wonder how it is related to the origin server, the format of their response or 
version?

Thanks!

--Zhenxin Wang
DoCoMo Labs USA

make a proxy cache server out of tomcat

[Zhenxin wang]

Hi,

I am thinking of using tomcat to build a proxy cache server. 
When a request comes into the proxy cache server, the server checks to see if the app 
is deployed in the local container.
If yes, the request is served by the proxy cache server.
If not, the proxy cache forwards the request to the origin server and get the response.

I wonder does current Tomcat code base have the request forwarding logic or not? If 
not, where can I get an open source java code for the request forwarding logic.

Thanks!

--Zhenxin Wang
DoCoMo Labs USA

Re: JMS for Tomcat

[Zhenxin wang]

 I do not think Tomcat supports JMS, Tomcat is only a servlet and JSP
container.

--Zhenxin Wang
DoCoMo Labs USA

- Original Message -
From: Ming Xie [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, August 15, 2002 1:33 PM
Subject: JMS for Tomcat


 Hi, Does anyone know if Tomcat supports JMS ? Where is the document if
yes.

 Can I use j2ee server from Sun as message system when I use Tomcat ?

 Please advise.

 Ming
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Tomcat and Naming

[Zhenxin wang]

What is the role of Naming (org.apache.naming packeage) in Tomcat?
Is it an essential part of Tomcat? Can the servlet container work without it?
If it can be taken off, what I have to sacrifice.

Thanks!

--Zhenxin Wang
DoCoMo Labs USA

updated architecture document

[Zhenxin wang]

Is there an updated architecture document (or a set of documents) that explains the 
architecture of Tomcat 4? I only found some that seems to be out of dated. 

Thanks!

--Zhenxin Wang
DoCoMo Labs USA

MinTC, got problem while try to run java -jar mtc.jar

[Zhenxin wang]

I downloaded the MinTC from DistribuTopia web site, and successfully built
mtc.jar.
When I try to run java -jar mtc.jar, I got the following error msg

Exception in thread main java.lang.NoClassDefFoundError: mtcserver

Looks like the mtcserver.java file generated into src directory from ant
gen_demo is empty. So is the file of webapps_cks_mtcdep.java .

Thanks!

--Zhenxin Wang
DoCoMo Labs USA




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Cluster

[Zhenxin wang]

This may be a trivial question.
Within the Tomcat context, what is exactly a Cluster ? And how is it related to other 
architecture components such as Engine, Host, and Context? How is it can be used or 
specified?

Thanks!

--Zhenxin Wang
DoCoMo Labs USA

org.apache.crimson

[Zhenxin Wang]

I noticed that there are objects in running Tomcat4.0.4 seen through a
java profiler (OptimizeIt), but did not find it in the source. I wonder
why? Looks like its functionality is about XML parsing. Is it because
they were built into JDSK1.4?
 
Thanks!
 
*   Zhenxin Wang
*   DoCoMo USA Labs

FW: Tomcat4 feature set

[Zhenxin Wang]

-Original Message-
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
he.org] On Behalf Of Zhenxin Wang
Sent: Friday, July 26, 2002 4:49 PM
To: [EMAIL PROTECTED]
Subject: Tomcat4 feature set

Hi,
 
Besides the obvious .html, servlet, and JSP, what are the other features
supported by Tomcat4? Such as JNDI, JDBC etc.
Is there a document explains the supported feature set?
 
Thanks!
 
Zhenxin Wang
DoCoMo USA Labs
 


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